Hi Simon,
Thanks for the comparisons with the Manzanitas. I figured a low 20mH crossover on the woofer would indeed make the TC9 work extra hard to cover such a wide range. The RS225 delivers the bass punch and midrange very well as the crossover slope is quite shallow.
Thanks for the comparisons with the Manzanitas. I figured a low 20mH crossover on the woofer would indeed make the TC9 work extra hard to cover such a wide range. The RS225 delivers the bass punch and midrange very well as the crossover slope is quite shallow.
Hi Guys,
first time writing here (and, as you will see, not expert in speaker design at all...)
I'm planning to build the monitors with the B80s in a 24lt box (10" baffle) using the specific XO by xrk971, but I would like to get some more bass extension without the Linkwitz transform.
What do you think of a vented design just adding a ~30 Hz tuned port (5x25 cm)? The group delay, also reported at the very beginning of this thread, looks "fairly" ok to me as well as the overall frequency response.
Has anyone tried the vented option? Any suggested substantial changes at the design that should be made/simulated/tested?
Thanks!
first time writing here (and, as you will see, not expert in speaker design at all...)
I'm planning to build the monitors with the B80s in a 24lt box (10" baffle) using the specific XO by xrk971, but I would like to get some more bass extension without the Linkwitz transform.
What do you think of a vented design just adding a ~30 Hz tuned port (5x25 cm)? The group delay, also reported at the very beginning of this thread, looks "fairly" ok to me as well as the overall frequency response.
Has anyone tried the vented option? Any suggested substantial changes at the design that should be made/simulated/tested?
Thanks!
Aatto made a bass reflex version - I think he used SB29 woofer and DSP so design was totally different. But you can make it a bass reflex vented port for more bass extension. The group delay won’t be as tight and you can already put a plug in the port to experiment with it on/off. I don’t see any harm in doing so. Just keep the 10in baffle width and driver CTC spacing the same. Make the volume whatever you need to optimize the tuning.
Perfect. Thank you very much! Volume will be more or less the same (mayby a couple more liters). Getting f3 @ ~40 Hz should be enough for my earing needs. Also, the smaller the box, the higher the WAF.
Hi,
just want to share my progress on the ported design with RS225-8 + RS100-8. The net volume is about 27lt, with ports tuned to ~30Hz. Now I must wait for the last XO parts (the coils) that hopefully will come on Monday. I cannot wait to try them... Happy Xmas!
just want to share my progress on the ported design with RS225-8 + RS100-8. The net volume is about 27lt, with ports tuned to ~30Hz. Now I must wait for the last XO parts (the coils) that hopefully will come on Monday. I cannot wait to try them... Happy Xmas!
Nice work! Looks neat with a port beneath the RS100. What are you using for the rear chamber, a quart plastic soup container? You should cover it with sticky butyl auto sound dampening sheets. Noico etc.
Happy Xmas everyone !
Happy Xmas everyone !
I finished the floor standers and am listening to them now. Trans Siberian Orchestra playing Christmas music. They really do sound great. The RS 225s are still fairly new, only a couple of hours on them, so I'm looking forward to them as the break-in a bit more. I'm running a Fostex FE85. I think I'll eventually go with the 10f/8424, but they sure sound good as is.
Thanks for sharing X!
Merry Christmas to all!!!
Thanks for sharing X!
Merry Christmas to all!!!
Attachments
Hi, the rear chamber is a 1.5lt plastic flower vase, with closed cell foam stuffing inside and 4 stripes of adhesive tar sheet outside. I've already used it for dampening purposes with good results, but I'm going to check its effectivness soon (I'm going to procure some Noico anyway).
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Awesome news! Those sound great with FE85 I bet. This speaker has a lot of possibilities with different brands of full range drivers. Allows some personalization of the sound signature. I think the PS95-8 is another good one, as is 3FE25-8, FR88EX, RS100-8, FF85WK, even a 2.5in one like TC7FD.
Thanks for sharing and merry Xmas!
The speakers bound for Hawaii have been playing 24/7 for a week now. First measurement of impedance sweep shows everything is working well and probably needs a tad bit more damping fill to bring the peaks below 20ohms for tighter bass. Tuning appears to be about 26Hz, which is correct and shows that there are no air leaks.
Hi X,
just a short question: do we need some kind of (rubber) sealing under the driver, especially under the RS225, in order to make this area airtight?
just a short question: do we need some kind of (rubber) sealing under the driver, especially under the RS225, in order to make this area airtight?
It should be airtight but I think the RS225-8 comes with a thin foam rubber gasket under the bezel doesn’t it? You can always use foam rubber gaskets for windows and doors etc. Thin sheets of EVA craft foam works too.
Hi X, just finished my couple of vented, they sound great!
I've slightly reduced the FR attenuation to ~4.5 dB (R1, R2 = 3.3 Ohm, 12 Ohm) cause I like a little bit more prominent highs.
Finish also came quite good, thank you for this wonderful project!
Happy new year
I've slightly reduced the FR attenuation to ~4.5 dB (R1, R2 = 3.3 Ohm, 12 Ohm) cause I like a little bit more prominent highs.
Finish also came quite good, thank you for this wonderful project!
Happy new year
Wow they look super cool....well done.! I'm sorely tempted to try a similar approach. I love my Ref Monitors but they just lack a little something in my room. Maybe the added output from the port might help some reflections to 'liven' up the presentation a bit or I try the wave guided RST28F in place of my PS95s.
I like the extra bass extension a lot, but I had to carefully find the right amount of stuffing. With about 200 gr of polyester pe rspeaker they are now perfect for my room